Load plugins from /usr/lib64 on 64-bit systems.
Load plugins from /usr/lib64 on 64-bit systems.

BUG=23859
TEST=compiles

Review URL: http://codereview.chromium.org/271068

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@28995 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser